Just registered so that I can post this here...
Got the 1500 headset about 2 weeks ago... paid a pretty penny for it, wanted something to replace my Blue Snowball + Headphone combo because it was too uncomfortable for gaming...
I'm also getting the white noise problem, I can confirm that it only happens when the microphone is enabled. So having a program like Skype, Bandicam, etc. open, the headphones will produce a white noise in the background.
I also had it in my recordings but have been able to minimize it by enabling 'Low Frequency Protection' under Windows 7 Enhancements for Microphone.
Even when I go into the microphone settings under Windows 7, it says there is a recording even at idle. The input level has one bar filled always, which clearly points to white noise being produced (I am in a fairly quiet room, even when I type the bar doesn't move...).
Hopefully we can get a driver fix for this issue... but I am wondering if it is the way the thing is engineered... possibly wires not protected enough from interacting with each other inside the headset. Sad that I bought this as an impulse purchase... let the tech at the store recommend once to me.